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/*
 * SmartGWT (GWT for SmartClient)
 * Copyright 2008 and beyond, Isomorphic Software, Inc.
 *
 * SmartGWT is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.  SmartGWT is also
 * available under typical commercial license terms - see
 * http://smartclient.com/license
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 */

import com.smartgwt.client.types.Alignment;
import com.smartgwt.client.types.ListGridFieldType;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.IButton;
import com.smartgwt.client.widgets.events.ClickEvent;
import com.smartgwt.client.widgets.events.ClickHandler;
import com.smartgwt.client.widgets.grid.*;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;
import com.smartgwt.sample.showcase.client.data.CountryXmlDS;
import com.google.gwt.i18n.client.NumberFormat;

import java.util.Date;

public class GridCustomGroupingSample implements EntryPoint {

    public void onModuleLoad() {


        CountryXmlDS dataSource = CountryXmlDS.getInstance();

        final ListGrid countryGrid = new ListGrid();
        countryGrid.setCanEdit(true);

        countryGrid.setWidth(500);
        countryGrid.setHeight(224);
        countryGrid.setAlternateRecordStyles(true);
        countryGrid.setShowAllRecords(true);
        countryGrid.setCellHeight(22);
        countryGrid.setDataSource(dataSource);
        countryGrid.setGroupStartOpen("all");
        countryGrid.setGroupByField("population");
        countryGrid.setAutoFetchData(true);

        ListGridField nameField = new ListGridField("countryName");
        ListGridField continentField = new ListGridField("continent");

        ListGridField independenceField = new ListGridField("independence");
        independenceField.setGroupValueFunction(new GroupValueFunction() {
            public Object getGroupValue(Object value, ListGridRecord record, ListGridField field, String fieldName, ListGrid grid) {
                Date independence = (Date) value;
                if(independence == null) {
                    return "Ancient";
                } else if (independence.getYear() < 10) { //if year < 1910
                    return "Pre-Industrial";
                } else {
                    return "Post-Industrial";
                }
            }
        });

        final int groupSmall = 1;
        final int groupMed = 2;
        final int groupLarge = 3;

        ListGridField populationField = new ListGridField("population");
        populationField.setType(ListGridFieldType.INTEGER);
        populationField.setCellFormatter(new CellFormatter() {
            public String format(Object value, ListGridRecord record, int rowNum, int colNum) {
                if(value == null) return null;
                try {
                    NumberFormat nf = NumberFormat.getFormat("0,000");
                    return nf.format(((Number) value).longValue());
                } catch (Exception e) {
                    return value.toString();
                }
            }
        });

        populationField.setGroupValueFunction(new GroupValueFunction() {
            public Object getGroupValue(Object value, ListGridRecord record, ListGridField field, String fieldName, ListGrid grid) {
                int population = (Integer) value;
                if(population < 100000000) {
                    return groupSmall;
                } else if  (population < 1000000000) {
                    return groupMed;
                } else {
                    return groupLarge;
                }
            }
        });

        populationField.setGroupTitleRenderer(new GroupTitleRenderer() {
            public String getGroupTitle(Object groupValue, GroupNode groupNode, ListGridField field, String fieldName, ListGrid grid) {
                final int groupType = (Integer) groupValue;
                String baseTitle ="";

                switch (groupType) {
                    case groupSmall:
                        baseTitle = "Population less than 100 million";
                        break;
                    case groupMed:
                        baseTitle = "Population between 100 million-1 billion";
                        break;
                    case groupLarge:
                        baseTitle = "Population over 1 billion";
                        break;
                }
                baseTitle += " (" + groupNode.getGroupMembers().length + " members)";
                return baseTitle;
            }
        });

        ListGridField countryCodeField = new ListGridField("countryCode", "Flag", 40);
        countryCodeField.setAlign(Alignment.CENTER);
        countryCodeField.setType(ListGridFieldType.IMAGE);
        countryCodeField.setImageURLPrefix("flags/16/");
        countryCodeField.setImageURLSuffix(".png");
        countryCodeField.setCanEdit(false);

        countryGrid.setFields(nameField, continentField, independenceField, populationField, countryCodeField);

        countryGrid.draw();
    }

}
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